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Other income and expenses, net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Notes and other explanatory information [abstract]      
Stoppages for asset maintenance and pre-operating expenses $ (2,205) $ (1,834) $ (1,362)
Gains (losses) on decommissioning of returned/abandoned areas (1,195) (225) 99
Pension and medical benefits - retirees (1) (1,172) (1,015) (1,467)
Losses with legal, administrative and arbitration proceedings (797) (1,362) (740)
Profit sharing (595) (131) (125)
Variable compensation programs (416) (547) (469)
Compensation for the termination of vessel charter agreements (2) (331) (13) (9)
Collective bargaining agreement (217)
Expenses with contractual fines received (199) (91) (57)
Operating expenses with thermoelectric power plants (189) (150) (88)
Institutional relations and cultural projects (156) (103) (96)
Gains (losses) with commodities derivatives 11 (256) (79)
Amounts recovered from Lava Jato investigation 109 96 235
Results of non-core activities 170 168 170
Ship/take or pay agreements and fines imposed to suppliers 238 105 96
Fines imposed on suppliers 239 228 163
Results from co-participation agreements in bid areas (3) 284 4,286 631
Government grants 315 471 154
Early termination and changes to cash flow estimates of leases 415 629 545
Reimbursements from E&P partnership operations 571 683 485
Results on disposal/write-offs of assets 1,295 1,144 1,941
Others (206) (261) 626
Total $ (4,031) $ 1,822 $ 653